Make our HTTP report for log actually transmit moves.
This change is simple as we can duplicate the ADD / REPLACE
code for moves.

* notes/http-and-webdav/webdav-protocol
  (log-report): add moved-path elements to our documentation

* subversion/mod_dav_svn/reports/log.c
  (start_path_with_copy_from): new utility handling changed paths
                               that _may_ have a copy-from; code
                               taken from log_receiver; handle moves
  (log_receiver): simplify; handle moves

* subversion/libsvn_ra_serf/log.c
  (log_state_e): add states for the new moved-path elements
  (log_ttable): add entries translating the new XML elements to
                internal state
  (log_closed): translate the new states to SVN path actions

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1535080 13f79535-47bb-0310-9956-ffa450edef68